JavaのOracleSqlステートメント

注：この回答は元の質問に適用されました。

注釈付きのSQLステートメント：

select a.name           -- 'a' is undefined
     , ird_num          -- note: always qualify (helps others read it)
     , loan_num         --   same
     , contract_date    --   same
  from a2_loan          -- is this support to have alias 'a'?
     , customer b       -- not table `a2_customer`
     , customer c       -- not table `a2_customer`
 where aname=b.ird_num  -- missing period(?), and 'a' is undefined
   and b name=c.name    -- missing period